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The use of the 210Pb method for preliminary evaluating the sedimentation rate in Amazon river mouth

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Althammer S., Fosshag E., Hoffmann H. M., Nery J. R. C., Bonotto D. M.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2010

tom 42

nr 1

149-157

This investigation reports the preliminary results for determining the sedimentation rate at the Amazonas River mouth, Brazil, by the 210Pb method. The CIC (constant initial concentration) of unsupported/excess 210Pb model was successfully applied to one sediments core. The measurements were made in a sediments core comprising ten samples 10 cm – thick each. The year of the sampling (2006) was used as reference for the establishment of the rate of sedimentation from the beginning of the top of the testimony. However, the atmospheric conditions and climate in Amapá State, Brazil, claimed for optimization of the results. Because the Channel North is opened into the Atlantic Ocean, it exhibits a huge water volume, causing a permanent motion of sediments and water. So, heavy waves are formed at the water surface, stirring the upper sand strata. Only at a depth of 40–50 cm the profile tends to be more homogeneous, where it is mostly composed by fine sand and very fine sand. Thus, it is reasonable utilize the CIC model from 210Pb data, which allows estimate a sedimentation rate corresponding to 0.61 g/cm²yr and a mean linear rate of 0.8 cm/yr. The 238U and 210Pb activities in the sediments allowed the reconstruction of the sedimentation processes over a period of about 130 years.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Althammer S.

1 Bonotto D. M.

1 Fosshag E.

1 Hoffmann H. M.

1 Nery J. R. C.

1 2010

Wyniki wyszukiwania

The use of the 210Pb method for preliminary evaluating the sedimentation rate in Amazon river mouth